Surfacing and polishing machine.



J.H.PRUGH. SURFAOING AND POLISHING MAGEINE.

: APPLICATION PIA-LED JAILZ. 1908.

928, 1 54; Patented Ju1y 13, 1909.

- 'WITNESSES. Q2" mvswm 6 SHBETS-SHEBT 1.

J.H. PRUGH. SURFAGING AND POLISHING MACHINE.

APPLIGATION FILED JAN. 2, 1908.

Patented July 13, 1909,

6 SHEETS-8HEBT 2.

INVENTOR WiTNESSES:

H. PRUGH;

SUBFAGING AND POLISHING MACHINE.

APPLICATION Hum 1mm. 1908. j

Patented July '13, 1909.

8 SHEETS-SHEET 8.

I NVENTO J. H. PRUGH. SURFAGING AND POLISHING MAGHINE. APPLICATION FILED mum, 1908.

WITNESSESi INVENTOR. $6. WW

I Patented July 13,1909.

6 SHEETS-SHEET 4.

J. H. P RUGH. SURPAOING AND POLISHING MACHINE.

APPLICATION FILED n.2, 190a.

' Patented July 13,1909.-

GBHEETS-SHEET 5.

l Q q .WITNESSES: INVENTOR.

xmiw h J. H. PRUGH.

SURFAOING AND POLISHING MACHINE. APPLICATION FILED JAN. 2. 1908.

928,154, Patented July 13, 1909.

GSHEETS-SHEBT 6. r

B f 0 L1 9-- E 17 E U a wwmassnas; I I INVENTOR. 90m W W $7M X? UNITED STATES PATENT OFFICE.

JOHN H. PRUGH, OF TOLEDO, OHIO, ASSIGNOR TO THE AMERICAN FLOOR SURFAGING MACHINE COMPANY, OF TOLEDO, OHlO, A CORPORATION OF ARIZONA TERRITORY.

SUBFACING AND POLISHING- MACHINE.

Specification of Letters Patent.

Patented July s, 1909.

Application filed January 2, 1908. Serial No. 409,048.

To all whom it may concern:

Be it known that I, JonN H. PnUeri, a citizen of the United States, and a resident of Toledo, in the county of Lucas and State have invented a new and useful.

of Ohio,

Surfacing and Polishing Machine; and I do hereby declare the following to'be a full,

.such use.

The object of my invention is the provision of a highly efiicient machine of this class, which is provided with simple and improved mechanism for imparting move-v ments to a plurality of abrading-members arranged about the same, whereby the members move in unison "and a portion of them in different directions to abrade the surfaces over which they move, the capacity of the machine is increased, and the practicability and commercial value thereof en hanced.

The operation, construction and arrangement of the parts of the invention are'fully described in the following specification, and illustrated in the accompanying drawings, in

I which Figure 1 is a plan view of the machine embodying my invention, with the top or platform of the frame and the parts supported thereby removed. Fig. 2 is a side elevation of the machine. Fig. 8 is an end elevation thereof with the motor removed. Fig. l is a central vertical section of an i abrading-block and its carrying part. Fig.

' tiontaken on isa top plan view of a modified form of the machine embodying my invention, with the top or platform and'the parts supported thereby removed. Fig. 6 is a vertical longi' tudinal section taken on the dotted line 00 m in Fig. the dotted line as as in Fig. 6.

Fig. 8 is a vertical transverse section of the 1nachine'frame on the dotted line y y in Fig.

(3 with a portion of the parts in the plane .with such line also: in section, and Fig. 9

direct the courses 0 Fig. 7 is a vertical transverse secis an enlarged top view in detail of the crank-arm, which operates the abradingblocks, and. the associated parts.

Referring to Figs; 1, 2, 3 and 4c of the drawings, 1 designates a suitable frame, which is shown as being supported at one end by a set of caster-wheels 2, 2, and at the other end by traction wheels 3, 3, which latter are carried at the ends ofa shaft 4 suitably journaled in the sides of the frame transversely thereof. The caster-wheels 2, 2 are mounted in forks 5, which have their heads journaled in bearing-brackets 6 se cured to the frame, and provided above said brackets with crank-arms 7, which are connected together by a rod 8 by means of which they are caused to turn in unison- One fork-head carries a steering-handle 9 for controlling the turning movements of the caster-wheels.

Surrounding the frame portion of the machine is a frame comprising the side-bars or rods 10, the end-bars or rods 10,and the corner coupling members 10". While this frame is shown as being rectangular in form it may be of any other shape as it may be desired to movement of the abrading members. Rigidly rising from the coupling members 10" are stems 11, which have free vertical movements in bearing bosses 11 secured to the frame 1 at the cor-' ners' thereof, as shown. The bars 10 and 10' are intended to form horizontal guides for guiding the reciprocatory movements of the holders 12, each of which carries an abradin -block 13 of carborundum, sandstone, or other suitable abrading material, two of said holders being shown as operating on each side bar and one on each end bar. The arrangement of the blocks, however, is 0ptional with the user. The holders 12 have their under surfaces suitably shaped to receive the blocks 13, which are retained there in by means of set-screws 14, and have their upper surfaces formed with laterally-spaced bearing-bosses 15, which are forked to form bearings for receiving the studs 16 projecting laterally from sleeves 17. These sleeves slide on the bars 10 and 10 and have bowed springs 18 secured to the under sides thereof with their arms extending longitudinally of the holders 12 and bearing against their tops at opposite ends of the sleeves, as shown 1n Fig. 4, thus enabling the holders 12 and their blocks 13 to have yielding oscillatory movements relative to their sleeves 17. A p1n19 passes through the furcations of the bosses l5 and engages the associated stud 16 to retain it to its seat in the boss.

The six abrading-blocks with which I have shown the machine as being equipped, have single piece or be formed of connected sec tions, and has its ends attached to the clamps 23 of one crank-arm at oppositesides of the wrist-pin, from whichit passes downward movement, as shown,

and in opposite directions under the sheaves 24, thence around the two corner sheaves 25 at the ends of the frame 1 and continues toward the center of the frame, passing under the sheaves 24 at the opposite side of the frame from whichit started and thence upwardly to and attaching to the clamps 23 'of the other crank-arm, as shown, thus forming an endless 'cablearound the machine. The cable 22 is securely attached to the sleeve 17 of the block-holders 12 by means of clamping-plates 26, and is adapted, when operated by a rotation of the crank-shaft 21, to impart simultaneously reciprocatory movements to the block-holders 12 on their respective guide-rods 10 and 10. The two holders 12 on each rod 10 are attached to the 'cable on opposite sides of the set of sheaves 24, and are so arranged that they are both at their limits of outward movements when the wrist-pin on the side therewith is at its lowest point of movement, and vice versawhen the wrist-pin is at its highest point of thus causing the blocks of a pair and also those on opposite sides of the machine to have opposed movements. 25, are loosely mounted on the stems 11, which rise from the coup-' The corner sheaves ling members 10 "of the block-carrying frame, while the sheaves 24 are carried by the vertical armsof the bell ;rank levers 27, which are fulcrumed to brackets 28 projecting from the sides of the frame 1, and have their horizontal arms in loose pivotalconnection, as shown in Fig. 2, to cause an oscillation of one to communicate a like movementto the other of the pair.

Fulcrumed to a boss 29 at each side of the frame 1 is a vertically-disposed lever 30, the upper end of which carries a roller 31 for working on the face of a cam 32 fixed to the crankshaft 21, while the lower end thereof bears against the outer edge of the vertical arm of one of the bell-levers 27 of the associated pair, whereby an outward movement of the upper end of the lever 30 imparts a converging oscillatory movement to the pair of sheaves. 24 carried by the levers 27.- The purpose of this mechanism is to move the pairs of sheaves 24 when the associated crank-arms are at their lowest and highest points of movement so as to draw the cable taut and take up the slack therein, as it is found in practice that when the cranks are in these positions, at which points the directions of movement of the abradingblocks is reversedythe cable becomes slack and will jump the sheaves if no means for tightening the same is provided. By referenceto Fig. 2 it will be seen that the cam 32 is elliptical in shape and has its major axis disposed transversely of the crank-arm 20,

thus effecting an outward movement of. the upper end of the lever 30 when a crank is both at its lowest and highest points of movement. V

A motor 33 is mounted on the platform 1 and communicates motion to a shaft 34 mounted transversely of the frame through a sprocket-wheel 36 on said shaft and sprocket-chain36. A small spiral-gear 37 on this shaft meshes with and'drives a larger spiral-gear 38 on the center-shaft 39, which shaft is mounted in suitable bearings longitudinally of the frame and carries a second spiral-gear 40, which meshes with a spiralgear 41 carried by the shaft 42. This latter shaft is mounted transversely of the frame 1 directly beneath the crank-shaft2l and car= ries a small spur-gear 43, which communicates rotation to thecrank-shaft through a larger spur-gear 44 thereon. It will thus be seen that the speed of rotation of the crank:

shaft is very materially reduced from that of the motor, thereby imparting a comparatively slow reciprocatory movement.to the abrading-members. The shaft 42 also carries at its center a worm 45, which drives a wormgear 46 carried by a countershaft 47 The shaft 47 is journaledin cross-pieces 48 secured intermediate the sides of the frame 1 and carries at one end a bevel-gear 49, which meshes with the opposed beveled-gears 50, 50 loosely carried by the shaft 4 on which the traction-wheels 3, 3 are mounted. Feathered on the shaft 4 between the gears 50, 50,is

- a movable clutch-member 51, which is adapted to be thrown into engagement with a clutch surface on either gear by an opera' tion of the lever 52, which controls a shipperarm 53. It will thus be seen that the machine may have avery slow movement communicated thereto in either direction when the machine is in operation.

The abrading-members may. be permittedto freely rest upon the surface to be operated on due to their own gravity and that of the guide-frame and su ported parts, or, if desired, the downwar pressure of such members may be increased by the provision of compression-sprin'gs54, on the stems 11, as

.shownx in'iFig. 2, or in any other suitable manner. A raising or lowering of the guideframe and. attached blocks is effected vby a proper oscillation of the lever 55, which is carried at one end of a rock-shaft 56 extend.

These levers are fulcrumed to the frame end,

at 59, 59, and have their inner ends loosely pivoted together,.=as at 60,'and their outer .ends forked to straddle the contiguous stems 11 of the guide-frame and engage theunder sides ofioppositely projecting studs 61 of said stems, thus causing a lowering of the inner ends of the levers 58, which is effected v by a straightening of the toggles formed by the lever 55-and link 57, toraise the-stems and attachedparts. The lifting mechanism .atthe. opposite end of the machine is the "same except that in place of the lever-58 a crankrarm 62 is ;carried by the shaft56 and connects with the link'57 at such end.

The operation of this construction of machine is. as follows :The abrading-members being lowered in contact with the surface to be operated'onl and the motor started, a slow rotation of thefldesired speed is-communicarted to the crank-shaft 21 from. the motor through the intermediate: reducinggearing, .and avery slow tractive movement imparted to the machine, provided, of course, the

. clutchsmember ol is in engagement with either gear 50, as shown. As the oppositelydisposed crankrarms. 20, 20 revolve, the at- .tached draft-cable 22, which; passes entirely around thelmachine and towhich the frames carrying the I abrading blocks are suitably 1 attached, is caused to have vlongitudinal lmovements first in one-directionand then in the other, suchv movements being reversed at each passing of a-.verti:cal plane by the crank-arms, thus imparting corresponding reciprocatory .movements to i the abrading members. At the instant of reversal of each movement of the cable 22 the levers 30 are automatically moved by; the cam 32 to effect aconverging movement of the sheaves 24 of each setseas-to ttake.up the slack then present in the cable to prevent its jumping from. the sheaves and also to prevent a su'dden starting or topping .of the abrading blOQkSi as their movements are reversed, thus obviating the jerking movement and noise which would otherwisebe present. -It will be apparent that the movements of the end abrading-members are transversely of the machine, and that the movements of the side abrading-members are longitudinally ofthe machine,with the blocks of'each-set moving awaywfromeach other on a idownstroke of the associated crankva-rm. and toward each other on an upstroke of such crank-arm;

The-slowutractivc movement of the machine during the operation of the abrading-memvbers causes the abrading. actions of such members to be uniformly distributed over formof my invention,"A-designates the main frame, which. is suitably supported by the tractiomv'vheels a, carricdx by the shaft Z), and by (the caster-wheels -c; B theguideframe vvhich carries at its sideszand ends the .slidingif-rames cl inwvhichhthe abradingblocks'are mounted, andcis shown as being to Figs: 1 to14 of the drawings.

The prlnclpal change in the modified fo-rm of my machine over that;

:described resides in the abrading-b ock operating-mechanism which Iawill nowdescribe. Mounted below the frame A transversely thereof with their ends suitably secured to previously the opposite headed ends of the yoke-inemher 0 are two spaced parallel bars D an which the cross-head 'E is suitably mounted for slidingmwvement longitudinally therethe crank-arm to impart a reciprocatory movement to the cross-head. j The sdraftcables or chains F, which are guided around the ends of the machineand'attached to the abrading-block frames d ove which they pass, have their ends exten ed inwardly around suitable, guide members i, carried by of, as shown. A vertical shaft 0 is journaled centrally vin the yoke-member C and carries at its lower end a crank-arm f, the wrist-pin of movement, thus causing a revolution of vertical spindles rising from the headed ends of the yoke C, and attached to oppositesides enlarged or headed to adapt it to shoulder against the upper end of the yoke bearing inwhich' it is journaled to limit its down-- ward movement therein, and is feathered within the hub of a bevel-gear j to enable the yoke and associated parts above described to rise and fall with the'guide-frame' of the cross-headyas shown, thus making B, to the side bars'of which the headed ends of: the yokeare attached, .:as shown. The

hub-of the bevel-gear j is extended: from its lower side and journaled in a bearingwprovided in the cross-beam 7a, which connects the sides of the frame A. The bevel-gear j.

- meshes with a smaller bevel-gear y" carried by the transverse shaft Z, the ends of which are journaled in suitable bearings in the The requisite rotation is comtrain of gears-H, said shaft m being journaled in the frame sides and carrying a pulley I at one end thereof without the frame, which pulley connects with a motor on the platform of the frame.

drives a worm-wheel 0 carried at the upper end of a counter-shaft 0'.- This shaft is journaled in cross-pieces 0 secured intermediate the sides of the frame A and carries at its lower end a bevel-gear p, which meshes with the opposed bevel-gears P P loosely carried by the shaft b on which the traction-wheels a are mounted. The rela-' tiverotation of the gears P P and shaft 6 is controlled by a sliding clutch part 1' in the same manner as described with reference toFigl.

The manner of connectin the casterwheels .0 to the machine rame is also slightly changed over that shown in Figs. 1 and 2, in order to enable said wheels to accommodate themselves to any unevenness in the surface over which they are passing without destroying the level position of the frame. This is accomplished by connecting the fork-heads s of the caster-wheels by a bolster-beam U, the ends of-w-hich loosely I receive the fork-heads and seaton the for tops, as shown. The bolster-beam is pro- Vided on its upper side with a suitable bearing in which the horizontal pivotal bearing part a of the machine frame rests, thus adapting the beam to have oscillatory movement relative to the frame. 1) o designate lever-arms on the fork-heads s, which arms are connected by the cross-piece w to adapt the wheels to turn in unison.

It is apparent that the operation of the modified construction of my machine is similar to that of the construction first described, except that instead of connecting the draft-cable ends to the wrist-pin blocks of the vertically-revolving crank-arms, as in the latter case, the cable ends are con nected to the horizontal reciprocatory crosshead E. which is actuated by the' movement of the horizontally revolving crank-arm f.

With this form of movement the movements v of the abrading-blocks are automatically".

slackened at the points of reversal of their movements due to the action of the crosshead and crank-arm when the movements of the cross-head are reversed, thus obviating a sudden stopping and starting of the blocks and the consequent injurious effect thereof.

The shaft. "Z also carries at its center a worm n, which 1. In combination, an angular guide.

frame, abrading-members carried by different portions of said frame and guided thereby to have movements in courses which are angled relative to each other, and mechanism' for moving the'blocks over their respective course's, V

' 2. In a surfacing-machine, a flexible draftmember guided horizontally around a portion of the machine and having s aced portions for movement transverse y of the machine,- means guiding the movements of said draft-member, abrading-block's attached to the opposed transversely movable portions of the d-raft-member,-;and mechamsm for moving said draft-member to impart reciprocatory movements to. said blocks.

3. In asurfacing-machine, a frame, wheels supporting the frame, a draft-member guided around a portion of the frame and having a portion movable transversely of the direcblock attached to the transversely movable portion of the draft-member, andmechanism for imparting slow tractive movement to the frame and reciprocatory movements to .the draft-member and attached block over draft-member to impart simu taneous rec procatory movements to the abrading-member disposed on opposite sides of the machine.

tion of movement of the frame, an abrading- 6. In a surfacing-machine, a draft-mcm- 7. In a -surfacing-machine, an angular flexible draft-member attached to the blocks, means guiding the draft-member to have an angled course of movement, and mechanism for causing the draft-member to have for- Ward and backwardfmovemen'ts' over 'its' course.

8. In a surfacing-machine, an angular frame, sheaves mounted at the corners and sides of said frame, abrading-blocks slidin'gly carried by the frame, adraftscable attached v ;to the blocks and guided by the sheaves, and

, mechanism for moving the draft-cable to impart reciprocatory movements to the blocks;

9. In combination, a rectangular frame abrading-blocks slidingly carried by said frame, a draft-cable attached to the blocks, mechanism for imparting reciprocatory movements to the cable, said mechanism be-- ing disposed transversely of the frame intera mediate its ends and being attached to opposed sides of't'he cable and means guiding the movements of the cable.

10. In combination in. .a surfacing-ma.- chine, guide-bars at the sides'thereof, abrading-members having their movements guided by said bars, a single element attached to the several abradingmembers on both sides .of I

' members.

' the machine, and mechanism for moving said element to impart backward and forward movements in unison to the abrading-'members.

11. In combination, a rectangular frame,

slidingly carried by the sides and ends of said frame, a flexible member guided relative to said frame and attached to the blocks, and mechanism for impartin slow tractive movements to the support an reciprocatory movements to the flexible member.

12. In a surfacing machine,'a plurality of abrading members, a reciprocatory block car.- ried by the machine, means guiding the movements of the block; a flexible draft member aving its ends attached tosaid block and its intermediate loop portion guided around a portion of the machine and attached to said abrading-members, and

mechanism for reciprocating said block to impart movement to the draft and abrading In testimony whereof I have hereunto signed my name to this specification in the presence of two subscribing Witnesses.

JOHN H. PRUGH. Witnesses:

G. W. OWEN, HAZEL B. HIETT. 

